> Input is via mini phono plug or RCA connector. There are two DC input
> connectors, ganged together to carry power to another accessory. I wired
> audio and DC from the accessory outlet 1, pins 2,5 and 7, on the back of
> Icom 775.
There probably is the potential to drive 20 headsets with a single car
stereo IC chip power amplifier.
If you use a fairly high power (compared to the power headsets need) audio
source with low source impedance, you can bridge a half dozen headsets
across the line without change.
Most radios fulfill this requirement on the speaker jacks.
Then a variable L pad can be used for volume, if needed, or even just a 500
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